HADOOP-9557. hadoop-client excludes commons-httpclient. Contributed by Lohit Vijayarenu.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1523185 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9350: move entry in changes.txt to 2.1.2-beta section

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1523191 13f79535-47bb-0310-9956-ffa450edef68
YARN-540. Race condition causing RM to potentially relaunch already unregistered AMs on RM restart (Jian He via bikas)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1523376 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch: upstream/trunk